Never a Tender Moment (1979)
The history of "Never a Tender Moment" is as grainy and faded as the few existing copies of this rare BDSM themed hardcore short. It was produced in 1979 at the O'Farrell Theater in San Francisco by Cinema 7, the Mitchell Brothers' film company. It was shot in the theater's "Ultra Room" and featured Marilyn discussing various bondage delights followed by scenes of intense kink, including a notable upside down bondage scene. The short was only available through direct mail order from the Mitchell Brothers and was likely available on 8MM and/or 16MM film first before being converted to VHS.
At the time, Marilyn Chambers usually appeared in live sex shows and this is one of them. It is considered an all-time underground classic and features Erica Boyer (billed as Carol Christy) in her first pornographic film.